Fuel Pressure: Testing and Inspection

FUEL LINE PRESSURE INSPECTION [MZI-3.7]

WARNING: Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death. Fuel can also irritate skin and eyes. To prevent this, always complete the "BEFORE REPAIR PROCEDURE".

1. Complete the "BEFORE SERVICE PRECAUTION". Before Service Precaution
2. Disconnect the negative battery cable.
3. Remove the fuel line schrader valve cap.







4. Turn the SST lever so that it is 90° to the hose as shown in the figure.
5. Make sure the lever of fuel pressure gauge is turned fully clockwise, then connect the SST to the schrader valve.
6. Verify that the selector is in N position.
7. Start the fuel pump using the following procedure.

Using M-MDS
1. Connect the negative battery cable.




2. Connect the M-MDS to the DLC-2.
3. Using the simulation function "FP", start the fuel pump.

Without using M-MDS
1. Remove the fuel pump relay.

CAUTION: Short the specified terminals because shorting the wrong terminal of the main fuse block may cause malfunctions.




2. Using a jumper wire, short fuel pump relay terminals C and D in the main fuse block.
3. Connect the negative battery cable and operate the fuel pump.

8. Measure the fuel line pressure, (during key on engine off (KOEO))
- If not as specified, inspect the following:
Zero or low
- FP circuit
- FP
- Fuel line (clogging)
- Fuel leakage inside pressure regulator
High
- Pressure regulator

Fuel line pressure
331-485 kPa {3.38-4.94 kgf/sq.cm, 48.1-70.3 psi}

9. Stop the fuel pump using the following procedure.

Using M-MDS
1. Stop the fuel pump using the "FP" simulation function.

Using M-MDS
1. Turn the ignition switch off.
2. Disconnect the negative battery cable to stop the fuel pump.

10. Disconnect the fuel pressure gauge and connect the fuel pipe.
11. Complete the "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION [MZI-3.7].) After Service Precaution